Coloring Books for Adults Mandala Modern Patterns Nature Henna Stress Relief Relaxation These coloring books for adults come in a set of 4 different styles. Featuring Henna to Color, Mandalas to Color, Nature to Color, and Patterns to color, these coloring books for adults provide a variety of pictures for you enjoy while you to unwind and relax. Each book has 32 pages of beautiful pictures. A great value for 4 Coloring Books for Adults.